Quantum data processing and error correction

Abstract

This paper investigates properties of noisy quantum information channels. We define a new quantity called {\em coherent information} which measures the amount of quantum information conveyed in the noisy channel. This quantity can never be increased by quantum information processing, and it yields a simple necessary and sufficient condition for the existence of perfect quantum error correction.

LaTeX, 20 pages

References in corpus (2)

• Good Quantum Error-Correcting Codes Exist
• A Theory of Quantum Error-Correcting Codes

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